Building block toy



FIG. 1 is a perspective view of a building block toy showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown are included for the purpose of illustrating portions of the article which form no part of the claimed design. 

CLAIM The ornamental design for a building block toy, as shown and described. 